Matsyapurana 16.24

16.24

abhighāryaṃ tataḥ kuryān nirvāpatrayamagrataḥ
te 'pi tasyāyatāḥ kāryāś caturaṅgulavistṛtāḥ //

Then he should sprinkle with ghee in front of the three nirvâpa plates. They should be of the same size, that is four fingers broad, and place on them balls of rice.—24.